This IS the Avid L2: [Avid-L2] Re: Will DNX 45 work with MCsoft 5.5.3?

Friday, February 8, 2013

[Avid-L2] Re: Will DNX 45 work with MCsoft 5.5.3?

John Moore wrote:
> I don't recall when this resolution became available. I remember dnx36
or some such offline resolution but that was only available in 24 frame
projects IIRC

DNxHD 45 is the same "strain" as DNxHD 36, just at 30/1.001 frames per
second rather than 24. In DNxHD, the size of each frame is identical, so
the overall bitrate increases as you increase the framerate. They're not
very clear about pointing this out in the documentation, though, and a lot
of people are confused about "DNxHD families."

Think of each DNxHD "level"/"strain"/whatever in terms of the bitrate per
frame.

Level 1 -- 1.5Mb per frame. 36Mbps at 24fps, 45Mbps at 29.97fps, 75Mbps at
50fps, 90Mbps at 60fps.
Level 2 -- 3.33Mb per frame. 80Mbps at 24fps, ~84Mbps at 25fps, 100Mbps at
29.97fps.
Level 3 -- 4.8Mb per frame. 115Mbps at 24fps, 120Mbps at 25fps, 145Mbps at
29.97fps.
Level 4 -- 7.29Mb per frame. 175Mbps at 24fps, 185Mbps at 25fps, 220Mbps at
29.97fps.
Level 5 -- Same as Level 4, but 10-bit.
Level 6 -- 14.5Mb per frame. 350Mbps at 24fps, 440Mbps at 29.97fps, all at
10-bit 4:4:4.

Or something close to that, my notes are a bit sloppy. And that's just for
1080p. But you get the idea. If you look at the DNxHD charts Avid provides,
it looks like a big mess of 65 different variants -- but really, there are
only a small handful of 'levels', all with specific filesizes per frame,
and the bitrate varies according to the framerate. So DNxHD 36 and DNxHD 45
are the exact same thing -- "DNxHD Level 1".

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